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Issue 9, 2026
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1988

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October

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Reviews of topical problems


Nonconservation of baryon number under extremal conditions

 a,  a, ,  b
a Institute for Nuclear Research, Russian Academy of Sciences, prosp. 60-letiya Oktyabrya 7a, Moscow, 117312, Russian Federation
b Theory Division, Europian Organisation for Nuclear Research CERN, Geneva, Switzerland

In gauge theories with left-right asymmetric fermion composition (e.g., in the standard model of electroweak interactions), the fermion number F is not conserved because of the anomaly $\partial_\mu j_\mu^F\sim F_{\mu\nu}\widetilde F_{\mu\nu}$. In models with small coupling constants, the amplitudes for processes with anomalous nonconservation of the fermion number are exponentially suppressed under normal conditions. It is shown that these are fast processes under extremal conditions, i.e., in the field of a magnetic monopole and at high densities and temperatures. An F-nonconservation mechanism associated with a level crossing phenomenon in external gauge fields is described. The theory and the experimental consequences of the monopole catalysis of proton decay are discussed. It is shown that both Abelian and non-Abelian gauge theories have a critical density above which cold fermion matter becomes absolutely unstable. The absence of the suppression of the anomalous electroweak nonconservation of fermion number at high temperatures is demonstrated, and the cosmological consequences of this phenomenon are discussed. The strong nonconservation of the fermion number in the decay of heavy fermions and technibaryons is also considered.

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Fulltext is also available at DOI: 10.1070/PU1988v031n10ABEH005633
PACS: 11.30.Fs, 14.80.Hv, 11.30.Ly, 12.10.−g, 11.15.−q, 98.80.Cq (all)
DOI: 10.1070/PU1988v031n10ABEH005633
URL: https://ufn.ru/en/articles/1988/10/b/
Citation: Matveev V A, Rubakov V A, Tavkhelidze A N, Shaposhnikov M E "Nonconservation of baryon number under extremal conditions" Sov. Phys. Usp. 31 916–939 (1988)
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Оригинал: Матвеев В А, Рубаков В А, Тавхелидзе А Н, Шапошников М Е «Несохранение барионного числа в экстремальных условиях» УФН 156 253–295 (1988); DOI: 10.3367/UFNr.0156.198810b.0253

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